Malicious PDF — malware analysis report

Static analysis result for SHA-256 270c91724632d1cb…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 04:59:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ae67f1542ec0a585c7d42881f06277c1 SHA-1: 72516ae6f8d9d9fd8dcf9fc9b9aaa502187d162d SHA-256: 270c91724632d1cb1544cdfd70a9e13209dfd84bf1858fc4fb5710fc0daa055c
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to websites offering game hacks and free currency, indicative of a link farm or scam lure. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' specifically flags the redirection to a 'free generator / game hack' URL. The ML classifier also strongly indicates maliciousness, supporting the conclusion that this document is designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/get-free-spins-coin-master-2021-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/hack-card-collection-coin-master_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-fb_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-roblox-generator-for-roblox_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-exploit-download_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-free-spins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robux-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/daily-free-spins-coin-master-heaven_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-spins-11-01-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-daily-spin-link_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/best-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005088.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5088 26148 bytes
SHA-256: 7d7a4145d6bf91fba3b0f77c8f230127872a8dec2e9ce88734baaedf8eb91c16
font_01_sfnt_off00008b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B03 18288 bytes
SHA-256: b38ddf3080d7f2bc752da259c3b03eae0df146b085052c6419baf797dcf0dadb

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